The real-mode emulator that Windows 7 uses to execute the vga bios rom becomes very confused when the code tries to dereference the stack pointer instead of using the frame pointer, leading to corruption of parameters passed on the stack from one function to another.
Signed-off-by: Julian Pidancet <[email protected]> --- Makefile | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/Makefile b/Makefile index c3ba2f3..cb00958 100644 --- a/Makefile +++ b/Makefile @@ -32,14 +32,14 @@ COMMONCFLAGS = -I$(OUT) -Os -MD \ $(call cc-option,$(CC),-Wtype-limits,) \ -m32 -march=i386 -mregparm=3 -mpreferred-stack-boundary=2 \ -mrtd -minline-all-stringops \ - -freg-struct-return -ffreestanding -fomit-frame-pointer \ + -freg-struct-return -ffreestanding \ -fno-delete-null-pointer-checks \ -ffunction-sections -fdata-sections -fno-common COMMONCFLAGS += $(call cc-option,$(CC),-nopie,) COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector,) COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector-all,) -CFLAGS32FLAT = $(COMMONCFLAGS) -g -DMODE16=0 -DMODESEGMENT=0 +CFLAGS32FLAT = $(COMMONCFLAGS) -fomit-frame-pointer -g -DMODE16=0 -DMODESEGMENT=0 CFLAGSSEG = $(COMMONCFLAGS) -DMODESEGMENT=1 -fno-defer-pop \ $(call cc-option,$(CC),-fno-jump-tables,-DMANUAL_NO_JUMP_TABLE) \ $(call cc-option,$(CC),-fno-tree-switch-conversion,) -- Julian Pidancet _______________________________________________ SeaBIOS mailing list [email protected] http://www.seabios.org/mailman/listinfo/seabios
